If an individual has 10 gene pairs, how many different gametes can be formed if three of the gene pairs are homozygous and the remaining seven gene pairs are heterozygous?
A) 49
B) 100
C) 128
D) 1024
E) 131,072
C) 128
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Sickle-cell anemia is a human disease that occurs as a result of what type of mutation in the b-globin gene?
A. silent B. missense C. nonsense D. frameshift E. sense
Which of the following describes why Mendel used the pea plant to study inheritance?
a. The pea plant grows quickly, so he was able to see results faster than with the other organisms he had studied. b. The monastery where he lived prevented him from studying inheritance in animals. c. The plant naturally self-fertilizes, which results in “true-breeding” individuals. d. Flower petal color is the only characteristic that can change from generation to generation, making it simple to study.
All of the following contributes to pathogenicity EXCEPT:
a. enzymes b. capsules c. toxins d. allergic reactions
If after several generations 30 percent of the males have antlers with 9 to 11 points, 40 percent have antlers with 15 to 17 points, and 20 percent have antlers with 12 to 14 points, this development will have been the result of:
A) directional selection. B) disruptive selection. C) stabilizing selection. D) founder effect.